Self Compacting Concrete
ABSTRACT Concrete has been the most preferred construction material for over five decades. It is being increasing day to day all over the world due to its versatility, mould ability, high compressive strength and many more advantages. For several years beginning in 1983, the problem of the durability of the concrete structures was a major topic of interest in Japan. The creation of durable concrete structures requires adequate compaction by skilled workers. One solution for the achievement of durable concrete structures is the employment of SCC which can be compacted into every corner of a formwork, purely by means of its own weight and the without the need for vibrating compaction.
SCC was first developed in 1988 to achieve durable concrete structure. Investigations for establishing a rational mix-design method and Self-compact ability testing methods have been carried out from the view point of making SCC a standard concrete. Modern application of SCC is focused on high performance, better and more reliable and uniform quality. SCC has been described as “the most revolutionary development in concrete construction for several decades”. It has proved to be beneficial because it allows faster construction, improved durability and greater freedom in design etc.
EFNARC, making use of practical experiences of its members with SCC, has drawn up specification and guidelines to provide a framework for design and use of high quality SCC during 2001.
Generally SCC is used in situations for concrete requiring high strength say over 40MPa to 100MPa or more. It is being blindly believed that SCC is much costlier than normal or high strength concrete. Though the material cost for SCC is high, if other components of costs such as cost of compaction, finishing etc are considered, one can realize that SCC is certainly is not a costly concrete for comparable strength.
Contents Page no * Introduction
SCC was first developed in 1988 to achieve durable concrete structure. Investigations for establishing a rational mix-design method and Self-compact ability testing methods have been carried out from the view point of making SCC a standard concrete. Modern application of SCC is focused on high performance, better and more reliable and uniform quality. SCC has been described as “the most revolutionary development in concrete construction for several decades”. It has proved to be beneficial because it allows faster construction, improved durability and greater freedom in design etc.
EFNARC, making use of practical experiences of its members with SCC, has drawn up specification and guidelines to provide a framework for design and use of high quality SCC during 2001.
Generally SCC is used in situations for concrete requiring high strength say over 40MPa to 100MPa or more. It is being blindly believed that SCC is much costlier than normal or high strength concrete. Though the material cost for SCC is high, if other components of costs such as cost of compaction, finishing etc are considered, one can realize that SCC is certainly is not a costly concrete for comparable strength.
Contents Page no * Introduction
References: * Okamura H, self compacting high performance concrete, concrete international 19(7)1997. * Manu Santhanam and Subramanian S, current development in SCC June 2004. * EFNARC specification and guidelines for SCC, European federation of producers and applicators of specialist products for structures 2002. * PCI Committee Summary Report. Summary appearing in PCI Journal, May-June 2003, pp 14-18. BIBILOGRAPHY * M S SHETTY, “Concrete technology, theory and practice ’’.New Delhi, S Chand & Co.Ltd. * Concrete Technology, 2/E A. M. Neville and J.J. Brooks.